[Distutils] command line versus python API for build system abstraction (was Re: build system abstraction PEP)

[Wes Turner]

On Nov 11, 2015 12:31 PM, "Robert Collins" <robertc at robertcollins.net>
wrote:
>
> On 12 November 2015 at 02:30, Paul Moore <p.f.moore at gmail.com> wrote:
> > On 10 November 2015 at 22:44, Nathaniel Smith <njs at pobox.com> wrote:
> >> "Stdin is unspecified, and stdout/stderr can be used for printing
> >> status messages, errors, etc. just like you're used to from every
> >> other build system in the world."
> >
> > This is over simplistic.
> >
> > We have real-world requirements from users of pip that they *don't*
> > want to see all of the progress that the various build tools invoke.
> > That is not something we can ignore. We also have some users saying
> > they want access to all of the build tool output. And we also have a
> > requirement for progress reporting.
> >
> > Taking all of those requirements into account, pip *has* to have some
> > level of control over the output of a build tool - with setuptools at
> > the moment, we have no such control (other than "we may or may not
> > show the output to the user") and that means we struggle to
> > realistically satisfy all of the conflicting requirements we have.
> >
> > So we do need much better defined contracts over stdin, stdout and
> > stderr, and return codes. This is true whether or not the build system
> > is invoked via a Python API or a CLI.
>
> Aye.
>
> I'd like everyone to take a breather on this thread btw. I'm focusing
> on the dependency specification PEP and until thats at the point I
> can't move it forward, I won't be updating the draft build abstraction
> PEP:

Presumably, it would be great to list a platform parameter description as
JSONLD-serializable keys and values (e.g. for a bdist/wheel build "imprint"
in the JSONLD build metadata composition file) ... #PEP426JSONLD

> when thats done, with the thing Donald and I hammered out on IRC
> a few days back (Option 3, earlier) then we'll have something to talk
> about and consider.
>
> -Rob
>
> --
> Robert Collins <rbtcollins at hp.com>
> Distinguished Technologist
> HP Converged Cloud
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